[humble] Recording stopped prints only once. (backport #1530)

[mergify]

This is an automatic backport of pull request #1530 done by Mergify.
Cherry-pick of 73b0772 has failed:

On branch mergify/bp/humble/pr-1530
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	both modified:   rosbag2_transport/src/rosbag2_transport/recorder.cpp

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[fujitatomoya]

lgtm

[fujitatomoya]

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